I have just moved my blog from one host to another. I did this using the standard import/export method and got the new installation to copy across all the attached images. The only difference is that the new host is running Wordpress multi-site.
The migration worked but the featured images are not showing. This seems to be because the_post_thumbnail() is now suggesting a different size to the old site and therefore the image file doesn't exist. This is all with the same theme - twentythirteen.
You can see the issue here. This is the old site:
and this is the same page on the new site:
Can anyone explain why this happening and how I can get it to show the images?
I did try changing the post.php and content.php entries as follows:
<?php the_post_thumbnail(array(604,270)); ?>
Which does display the image but the proportions are wrong. Also I don't really want to be customising the standard theme.